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Why would you uncheck V.Sync? Generally, it makes no difference.. vertical sync just syncs your FPS to be, at a maximum, the max frame rate of your monitor, so rendering is only done 1/Nms (where N is the max refresh rate of your monitor). Turning that off means it's executed every game loop update which makes load on the graphics card pretty high.

Why would you uncheck V.Sync? Generally, it makes no difference.. vertical sync just syncs your FPS to be, at a maximum, the max frame rate of your monitor, so rendering is only done 1/Nms (where N is the max refresh rate of your monitor). Turning that off means it's executed every game loop update which makes load on the graphics card pretty high.

The only time you need V-sync is if you get screen tearing or if you allready have an stable 60+FPS with everything maxed out.... V-sync will decrease your FPS alot and as you said will limit the fps to the update frequency of your monitor.

By disabling V-sync you will get a really good FPS increase.

A quick example:
I could only play LoL on very low/shadow off with around 25fps while having v-sync on.
After turning it off I could play at all medium settings with around 45fps.